Question:
I would be most interested in hearing your views regarding that dialogue of Plato's where Socrates argues (with Euthyphro, I think) that moral acts are not moral because the gods love them, rather the gods love moral acts because they are moral (the actual discussion is about piety). Contemporary philosophy has embraced Socrates' view. But I believe that the Torah view -- if I understand it correctly -- is that Socrates got it backward: What makes theft, etc., wrong isn't an intrinsic quality in the act that we as well as G-d can perceive. What makes theft wrong is that it is displeasing to G-d (or that G-d decided he doesn't want us to steal).

Answer:
The crux of it is that to Plato and Socrates, things are the way they are because they must be that way. Time and matter are necessary entities. The principles of Euclidean geometry are "self apparent truths" that could not be otherwise. This notion runs throughout Greek philosophy. And it is perhaps the central point of divergence with Jewish thought.

The Jewish G-d has free choice. He chose time and space. But He could just as well have chosen entirely other parameters. We can have absolutely no comprehension of what those parameters might be, since He did not choose them and therefore they never came to exist, even in concept. But there is nothing compelling about time and space in particular, or about the way they work, that compels their Creator to create them. And similarly with the rules of logic, causality, geometry, and, yes, ethics.

This is truly the concept behind the very first verse of the Torah, "In the beginning G-d created the heavens and the earth." As you know, in the Septuagint (the ancient Greek translation of the Bible), G-d makes heaven and earth -- because the Greeks simply didn't have a word for creation out of nothing. The idea to them was more than absurd -- it wasn't even in the lexicon.
But there's more: The active form of the verb (G-d created -- not "Heaven and earth came into being") implies that this was an act of volition. In fact, when the act of creation is describe as "And G-d said...", Nachmanides translates that as "And G-d willed...". Nothing had to be created. But He did create, so we are here.

The sweeping inclusion of "heaven and earth" also has weighty implications. Heaven is generally understood in mythology as the source of our existence down here. The way the gods are up there are to blame for how we are down here. But in Torah, nothing precedes our existence. G-d, who cannot truly be called an "existence", originates it all out of the void.

Nothing precedes our existence, not even the absence of it -- for there was no time according to almost all the classic Jewish thinkers. So there was no before. In creating our existence, G-d also creates the absence of it -- meaning that it could also not be.

Therefore, the Jewish G-d cannot be properly called a "Primal Cause", since that would imply a necessary effect in consequence of the cause. The existence of the universe has no cause. There was no potential for a world to exist preceding it. Nothing. And so, it could be made any way He wishes it to be made.

Unnecessary Ethics
Now to the issue that you raise, concerning ethics. If the cosmos were a necessary existence, both in matter and form, one would have to conclude that the ethics needed to sustain this cosmos are also necessary. The question of why there is evil in the world would have to be dismissed by assuming this to be also necessary, as an artifact of the matter of which the world was made, or some other similar explanation.

But this is how the rabbis put it in an ancient Midrash (Breishit Rabbah):

At the onset of the world's creation, G-d beheld the deeds of the righteous and the deeds of the wicked... "And the world was chaos and void" (Genesis 1:2) -- these are the deeds of the wicked. "And G-d said: Let there be light" (ibid. verse 3) -- these are the deeds of the righteous. But I still do not know which of them He desires... Then, when it says, And G-d saw the light, that it is good" (verse 4), I know that He desires the deeds of the righteous, and does not desire the deeds of the wicked.

What the Midrash is saying: On the first day of Creation, G-d said there should be light. But there was also darkness, chaos and void. Then the Torah tells us that G-d called the light day and the darkness He called night.

The rabbis interpret light and darkness in a broad sense. At this point, there already exist two options: The deeds of the righteous and the deeds of the wicked. And at this point, there is no way to know which one G-d desires. There is nothing intrinsic about good or about G-d that G-d must choose good.

As the Book of Job (35:6) states: "If you sin, how have you affected Him? If your transgressions multiply, what do you do to Him? If you do righteously, what have you given Him? What can He possibly receive from your hand?"

But then, the Genesis story continues and says, "And G-d saw the light, that it was good." So now we know that G-d chose to desire the deeds of the righteous.

But G-d did not have to choose good over evil. He could have chosen violence, theft and all other destructive elements. More significantly, He could have chosen that both good and evil remain in constant struggle. As the Baal Shem Tov explains this Midrash, G-d could have decided that darkness makes a very nice setting for light, and evil makes a similarly fitting background for good. And He could have just desired that things continue that way, eternally. He didn't - but the option was there.

Tolerating Evil
This is the best explanation I know for the great quandary of evil: Since G-d created "the heavens and the earth," and since He chooses good and not evil, then how on earth does evil ever come to be? How can that which opposes His will be derived from His will? Since we believe in creation ex nihilo, including, as Nachmanides describes in detail, the very material out of which all is made, there's no one and nothing left to blame evil upon. All is from Him.

If G-d hated evil because it opposes Him in essence, this quandary would be insurmountable. Once we say that He chose to hate evil, the issue is dismissed. On the contrary, that very choice to hate evil is the ultimate source that brings evil to existence by implication. After all, you can't hate something that doesn't exist. So evil exists in order for G-d to despise it. Or better, it exists out of G-d's spite for it.

Steve Goldstein, architect, was lost on an unnamed island in the South Pacific for who knows how many years. When they finally came to rescue him, they were amazed to find him the singular inhabitant of a small town, all of which had been designed and built by Steve Goldstein, architect. Before Steve left, he gave them a tour - of his house, his café, his supermarket, his movie theater, his sports arena, and finally, his prize achievement, his synagogue.

But there was one tall building he did not take them to. He seemed intent on ignoring all their questions about it. When they insisted and persisted, he gestured in annoyance and replied, "Oh, that. That's the shul I don't go to."

Everyone needs a shul they don't go to. Every story written has an antagonist. Every game has a challenge. And G-d creates evil. As the prophet Isaiah said as clear as can be, "He forms light and creates darkness, makes peace and creates evil" (Isaiah 45:7). His will creates goodness and His disdain creates evil.

The rabbis of the Talmud (Yoma 69b) say this much in their own style:

When Jeremiah witnessed the destruction of Jerusalem and the Temple, he cried, "Where is His awesomeness? Where is His might? Idolaters are dancing in His Temple and He is silent!"

Later, in the time of Babylonian Exile, when the Men of the Great Assembly established a standard version of prayer, they needed to choose superlatives by which to praise G-d. They chose, "the mighty and the awesome G-d." To Jeremiah's question, they answered, "That itself is His awesomeness, that itself is His might. He sees those who go against Him and He is silent."

G-d is not impelled to act against evil, since its very existence is by His choice. He is able to stand back (figuratively, of course, since we understand Him as being imminent as well as transcendent) and watch the drama unfold.

His Free Choice and Ours
This explains our realm of free choice, as well: Since good and evil exist by their Creator's volition, so, too, they are acted out by volition. In other words, we, the players in this drama, choose the path of our drama, towards good or evil, just as the Author chose that these paths should exist in the first place.

The cycles of nature, the paths of the stars, the laws of motion, etc. - in all these (i.e. most of our everyday life), we have no choice. Only in matters of choosing between good and evil do we have a choice. We can't make spring come before winter, or make children older than their parents, or revise one plus one to become five. But we can decide not to clobber the guy in the next cubicle, or give a few more dollars to a good cause. As the Talmud puts it, "All is in the hands of Heaven, except for the fear of Heaven."

But doesn't G-d also have free choice in determining these laws and patterns? Since G-d is a free agent in all things, we should also be!

On this, the fifth Rebbe of Chabad, Rabbi Sholom Dov Ber, provides an insight. First G-d chose what will be good and what will be evil and the dynamic between them. Once this was determined, all things were designed as the background to this drama. Since the drama had already been written, the background could only be designed in one way. No choice was left. Therefore, we, too, have no choice in these matters.

Absolute Hatred
One last point: One may take a wrong turn under the influence of the above discussion, assuming that since G-d chose to hate evil, therefore it doesn't really matter so much to Him, since He could always turn around and change His mind. In fact, just the opposite is true. When something is hated for a reason, the degree of hatred is commensurate to the worthiness of that reason. But when, with nothing compelling either way, G-d chooses light over dark, this is a choice from the very essence of G-d. It is therefore compelling without limit.

G-d can forgive us for choosing evil, since He is above the drama. But He does not forgive the evil itself. After all, that is what He chose: that He will hate evil with an ultimate hatred, and eventually have it utterly destroyed - may that be sooner than we can imagine.